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Alloy UNS N08827: A New and Advanced Version of Alloy UNS N08825 With Better Corrosion and Hot Cracking Resistance

Picture for Alloy UNS N08827: A New and Advanced Version of Alloy UNS N08825 With Better Corrosion and Hot Cracking Resistance
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Product Number: 51321-16398-SG
Author: Julia Botinha; Bodo Gehrmann; Martin Wolf; Helena Alves
Publication Date: 2021
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Alloy UNS(1) N08827, herein called Alloy 825 CTP, is a nickel-iron-chromium alloy with additions of
molybdenum and copper. It was recently designed as a further development of the standard Alloy 825
(UNS N08825) for applications in the chemical process industry as well as in the oil and gas industry,
where resistance to pitting and crevice corrosion in chloride environments is required.
Because of its high nickel content, alloy 825 CTP shows an outstanding resistance to stress corrosion
cracking in aqueous and acidic chloride-containing solutions. Furthermore, as showed by previous
tests, its increased molybdenum content of around 6% leads to an increased critical pitting temperature
in comparison to standard alloy 825.
In combination with the ameliorated corrosion resistance of Alloy 825 CTP, in particular the absence of
titanium in its chemical composition promotes a reduction of its susceptibility to hot cracking during
fusion welding. The improvement of weldability is shown in the present study theoretically, through
themodynamical modeling of the solidification process and confirmed hereafter experimentally, through
Modified Varestraint Transvarestraint (MVT) hot cracking tests.
Plasma arc welding (PAW) trials simulating component weldments were additionally carried out to test
the weldability of Alloy 825 CTP under nearly practical conditions. These weldments were evaluated by
metallographic examinations and corrosion tests like ASTM(2) G28 A and ASTM G48 A, C and D.

Alloy UNS(1) N08827, herein called Alloy 825 CTP, is a nickel-iron-chromium alloy with additions of
molybdenum and copper. It was recently designed as a further development of the standard Alloy 825
(UNS N08825) for applications in the chemical process industry as well as in the oil and gas industry,
where resistance to pitting and crevice corrosion in chloride environments is required.
Because of its high nickel content, alloy 825 CTP shows an outstanding resistance to stress corrosion
cracking in aqueous and acidic chloride-containing solutions. Furthermore, as showed by previous
tests, its increased molybdenum content of around 6% leads to an increased critical pitting temperature
in comparison to standard alloy 825.
In combination with the ameliorated corrosion resistance of Alloy 825 CTP, in particular the absence of
titanium in its chemical composition promotes a reduction of its susceptibility to hot cracking during
fusion welding. The improvement of weldability is shown in the present study theoretically, through
themodynamical modeling of the solidification process and confirmed hereafter experimentally, through
Modified Varestraint Transvarestraint (MVT) hot cracking tests.
Plasma arc welding (PAW) trials simulating component weldments were additionally carried out to test
the weldability of Alloy 825 CTP under nearly practical conditions. These weldments were evaluated by
metallographic examinations and corrosion tests like ASTM(2) G28 A and ASTM G48 A, C and D.

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Sensitization Resistance of Alloy UNS N08825 After Different Mill-Annealing Temperatures and Times

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On the weldability and corrosion resistance of alloy UNS N08827 – a further improvement of alloy UNS N08825

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Author: Julia Botinha, Martin Wolf, Helena Alves
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Recently, the nickel-based alloy UNS N08827, commercially known as VDM ® Alloy 825 CTP(3), has been presented to the oil and gas industry as an alloy that has been developed to fill in the existing gap between both UNS N08825 and UNS N06625 in terms of localized corrosion resistance. It is a solid-solution nickel alloy with chemical composition similar to UNS N08825, except for its doubled molybdenum content and the no addition of titanium.
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